Stockholders' Equity (Stock Options Vested, or Expected to Vest and Exercisable) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2024	Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, Number of options	3,220	3,578
Options vested and exercisable, Number of options	2,725
Options vested and expected to vest, Number of options	3,202
Options outstanding, Weighted-Average Exercise Price	$ 86.54	$ 86.03
Options vested and exercisable, Weighted-Average Exercise Price Per Share	83.56
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 86.44
Options outstanding, Weighted-Average Remaining Life in Years	5 years 2 months 12 days
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 8 months 12 days
Options vested and expected to vest, Weighted-Average Remaining Life in Years	5 years 2 months 12 days
Options outstanding, Aggregate Intrinsic Value	$ 257,174
Options vested and exercisable, Aggregate Intrinsic Value	225,758
Options vested and expected to vest, Aggregate Intrinsic Value	$ 256,148